or download this
me@office:~$ locate List/Util.pm
/home/me/.cpan/build/ExtUtils-MakeMaker-7.24-adRDIa/bundled/Scalar-Lis
+t-Utils/List/Util.pm
...
/home/me/.cpan/build/Scalar-List-Utils-1.45-zv9hHr/lib/List/Util.pm
/home/me/perl5/lib/perl5/x86_64-linux-gnu-thread-multi/List/Util.pm
/usr/lib/x86_64-linux-gnu/perl/5.20.2/List/Util.pm